atan2(Y;X)
Returns the two-argument arctangent function (equal to
atan(y/x) when x is positive) as an angle expressed in
radians.
(Available as of version
16.02)
Syntax
atan2(Y;X)Input
| Argument | Type | Description |
|---|---|---|
Y |
any numeric type | A numeric value |
X |
any numeric type | A numeric value |
Return Value
Returns a decimal number corresponding to the inverse tangent, or arctangent, of
Y and X. It is similar to calculating the
arctangent of y/x when x is positive, except that the signs of both arguments
determine the quadrant of the result. Note: The result is a measurement in
radians.
If Y is N/A, the result is N/A.
If Y and X are both 0, then
atan2(Y;X) is arbitrarily defined as zero.
Sample Usage
Y |
X |
atan2(Y;X) |
|---|---|---|
| 1 | 1 | 0.7854 |
| -1 | 1 | -0.7854 |
| 1 | 0 | 1.5708 |
| NA | 1 | NA |
| 0 | 0 | 0 |